Caribbean blue is what you want. I would: start with an opaque white undercoat, then go over that with pearl white. Fade from the top down with the blue. Then add some glitter to whatever you clear coat with. Thats just how I would do this. I forgot if createx has a pearlescent light blue, but if they do, that might be better than plain caribbean blue. Or you could even add a touch of silver pearl to the blue to pearlize it. The glitter should do just fine though. I curious to see how others would interpret this recipe.
Luke
on a second look, I think I might see some green mixed in at the very top. If so, I'm way off.